Injector



(ModeL) '2 Sheets-Sheet 1.' W. McELROY 8v H. GONNETT.

INJECTOR.

Pftehted May 3, 1887-.

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Phara- UNITED STATES PATENT, OFFICE.

WILLIAM MOELROY AND HENRY OONNETT, OF BROOKLYN, NEW YORK.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 362,298, dated May 3,1887.

Applicationfiled September 8, 1886. Serial No. 213,034. Modoh) To allwhom it may concern:

Be it known that we, WILLIAM McELRoY and HENRY Oonrznrr, both citizensof the United States, and residents of Brooklyn, K ngs county, New York,have invented certalnnew and useful Improvements in lnj ectors, of whichthe following is a specification.

Our invention relates to injectors belonging tothe class oflifting-injectors wherein theinector at starting first produces avacuumand raises the water, and then,when the proper velocity is attained,forces the water into the generator. I Theobject of our invention is toprovide an improved lifting-injector having an automatically-operatingvalve arranged between the overflow branch or outlet and the combining,lifting, and discharging nozzles, whereby, when the steam is firstturned on, it opens said valve and allows the steam and water tooverflow at the said overflow-branch; but when theproper velocity isestablished in the combinlng and discharging cones this valve closes andprevents the admission of air from the overflow-branch.

Another feature of our injector is the arrangement of a drip check-valveto control the admission of water, whereby, should the vacuum break, thewater is prevented for the time from flowing back, or until the vacuumis re established.

Our invention will be hereinafter fully described, and its novelfeatures carefully defined in the claims.

In the drawings which serve to illustrate our invention, Figurelisalongitudinal axial elevation of the injector. Figs. 2 and 3 are crosssections of same, taken, respectively, 1n the planes indicated by lines2 2 and 3 3. Fig. 4. is a fragmentarysection similar to Fig. 1, butshowing the automatic valve lifted or open. Fig. 5 illustrates a slightmodification, which will be hereinafter described. Fig. 6 alsoillustrates a slight modification or variation in the mechanicalconstruction of the injector, that will be .hereinafter described.

A is the injector-casing, in which are constructed the water-receivingchamber a and the overflow-chamber a, the two being separated by apartition, o

B is the inlet-branch for the water, opening into chamber a, and (l isthe overflow-branch, opening out from chamber a.

D is a lifting check-valve in the receivingcbamber a, arranged to checkthe outflowof water from said chamber at branch 13 in case the vacuumbreaks. This valve has a small perforation or aperture, I), whichpermits the water to gradually drain from chamber a after the injectorhas been stopped. This is designed to free said chamber of water, andthus prevent freezing in cold weather. It is only necessary that thechamber a shall have such va drainage-aperture, and we prefer to make itin the valve, as shown; but it mightlbe ar ranged under the valve orotherwise.

E is the steam-inlet from the generator. F

is the steam-cone connecting with said inlet.

Gis the lifting-cone into which the steam-cone enters. His thecombining-cone. Iis the discharging-cone, and J istheinjector-outletleading to the generator.

Around the combining anddischarging cones H and I is arranged acasing,K,whichis coned at its upper part and connected integrally, bypreference, with the lifting-cone G. In the coned upper portion of thiscasing K are formed large ports or openings 0 c, and over these portsfits a cone-shaped valve, L, the upper part of which fits on and mayslide over the lifting-cone G, which is made cylindrical exteriorly.

The combiningcone H is connected by supports d d with a ring, which isscrewed onto the discharging-cone I. The casing K is also screwed ontothe discharging-cone, and the latter is formed, by preference,integrally with the outlet-branch J, which is screwed into the bottom ofthe injector-casing A. The upper end of the lifting-cone G fits snuglyin an aperture in the partition a.

It will be seen that when the valve L is in the position seen in Fig. 1it closes the ports or openings 0 c in casing K, and the overflowchambera and overflow-branch G are entirely out off from the passage throughthe several cones; but when said valve is raised, as in Fig. 4, thecommunication between'said passage and the overflow is fullyestablished.

The operation is as follows: When steam is admitted to the injector itpasses into the casing K through the lifting-cone, and, acting on theflared inner face of valve L, raises the same and blows out through theports a c and overflow-branch O. This establishes a vacuum. Vater risesthrough inlet-branch B by raising valve D, passes through theliftingcone and ports 0 c, and overflows at branch 0. As soon as acurrent with the proper velocity is established in the injector, thevalve L will drop and close, and the water that may have collected incasing K will be drawn into the discharging-cone I. The valve L preventsthe entry of air to casing K from branch 0. Should the vacuum break forthe moment, check-valve D will instantly close and prevent the suddenoutflow of the water from chamber a, and the water will thus be held insaid chamber until the vacuum is again estab lished.

It will be seen that casing K forms a chamber in which is housed thepassage through the cones, and this passage is cut off from theoverflow-outlet by the valve L, which is normally closed, and whichopens only when the back-pressure from the inside is sufficient to liftit. This employment of a normally-closed valve has the advantage that,if it should stick from any cause, it will assuredly be raised by theinside pressure before a current is established through the cones atstarting; and if the vacuum breaks for an instant, the valve only riseshigh enough to emit a very little steam. In practice we find that thereis a minimum emission of steam at the overflowoutlet and very littleoverflow of water thereat.

The construction of our injector is very simple and inexpensive. In ascrew-cap, M, is formed a guide for the stem of valve D, and said valvemay be inserted at the opening closed by said cap. The enlarged base ofsteam-cone F screws into casing A, and is pro vided with a female screwto receive the end of the steam-pipe from the generator. Theoutlet-branch J, carrying all of the interior parts except thesteam-cone, is passedinto the bottom of easing A and screwed fasttherein.

IVhere the injector stands with its axis vertical, as in Figs. 1 and 4,we do not usually employ extraneous means for closing the valves D andL; butif the injector be placed in other positions, springs may bearranged back of them to close them.

Ve sometimes construct a port, 0, in the side of the combining-cone H,to enable the water to escape from said cone the more freely;-

but this we have not found essential in the smaller sizes of injectors.

In Fig. 5 a slight modification is shown. In this construction thelifting-cone is screwed into the partition a, and a space is leftbetween its lower end and the upper end of the cylindrical part ofeasing K, the conical ported portion of said casing being entirely cutaway or omitted. Thevalve Lslides on cone G and seats on the upper endof easing K, thus closing the annular aperture or space between cone Gand easing K.

In Fig. 6, which is an axial section similar to Fig. 1, we have shownthe injector as slightly modified in its mechanical structure, but notin the least altered in principle. In describing this modification itwill be necessary only to indicate wherein the mechanical constructiondiffers from that seen in Figs. 1 and 5. The water-inlet B is turned ordirected outward and constructed to receive a coupling or union, as isalso the steam-inlet E. The cone F is screwed into the casing from theinside. The casing K is screwed directly into the casing A at a. Thecone I is not formed int-egrall y with the cap that closes the bottom ofeasing A, but screws into the same. The support d is formed integrallywith the cap closing the bottom of the casing, and the cone H is screwedinto said support. The overflowoutlet is provided with a female screw toreceive a waste-pipe, if such should be needed. The operation of thisinjector is the same as that already described.

We are fully aware that it is not new to arrange a check-valve in theoverflow-branch or outlet of an injector, and this we do not claim; nordo we claim, broadly, the insertion of a check-valve in the water-inlet.Such a valve has been proposed; but it has not been provided with adrip-aperture.

\Ve are also aware that in one form of lifting-injector the combiningand discharging cones are connected and arranged to slide to and fro, soas to serve as a valve, and this we do not claim. In this latter form ofinjector the passage to the overflow controlled by the sliding cones isnormally open, while in our injector it is normally closed; but

What we do claim is- 1. In an injector, the conbination of anoverflow-chamber having an outlet, thelifting-cone G, the combining-coneH, the dischargingeone I, the coned and ported casing K, embracing orhousing said cones G, H, and I, and the valve L, mounted on the cone Gand controlling the ports in the casing, substantially as set forth.

2. In an injector, the combination, with a lifting-cone, G, and conedand ported casing K, of a coned valve, L, mounted on said casing andcontrolled by the force of a jet of steam or by the combined force ofsteam and water to automatically open the ports in said casing K, andcombining-cone H, arranged within said casing, substantially as setforth.

3. In an injector, the combination, with an overflow-chamber, a, havingan outlet, of the lifting-cone G, the conical or flaring valve L,mounted on said cone G, the ported casing K, constructed integrally withthe cone G,and the combiningcone H, arranged within said casing K,substantially as herein set forth.

4. In a lifting-injector, the receiving-chamber provided with acheck-valve to prevent the sudden outflow of the water when the vacuumbreaks, said chamber being provided with a small drainageaperture,substantially as set forth.

5. The combination, with the receivingchamber a, of the valve D, mountedtherein over the inlet and provided with a drainageaperture, 72,substantially as set forth.

6. The combination, with a casing, A, divided by a partition, of, intotwochambers, a and a, of the discharging-cone I, screwed into the bottomof chamber a, the casing K, formed integrally with cone G, provided withports a c in its coned upper part and screwed onto the discharging-cone,the lifting-cone G, its upper end fitted into partition a, the valve L,mounted on cone G and easing K, and the combining-cone H, mounted oncone I within casing K, as set forth.

7. In an injector, the combination, with the shell divided by apartition into a receivingchamber and an overflow-chamber for the water,of the lifting-cone, the combining-cone, and the discharging-conearranged in said overflow-chamber, a casing, K, arranged in saidoverflow-chamber, and an automaticallyoperated valve, L, arranged insaid overflowohamber, said valve controlling a passage from the interiorof said casing K to the overflow-chamber exterior thereto, as set forth.

In witness whereof we have hereunto signed our names in the presence oftwo subscribing witnesses.

WILLIAM MOELROY. HENRY OONNETT.

Witnesses: I

FRANK MOULIN, J OHN CAPLINGER.

